Publications by authors named "Alessa Gambardella"
The autoxidation of triglyceride (or triacylglycerol, TAG) is a poorly understood complex system. It is known from mass spectrometry measurements that, although initiated by a single molecule, this system involves an abundance of intermediate species and a complex network of reactions. For this reason, the attribution of the mass peaks to exact molecular structures is difficult without additional information about the system.
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- Ultramarine blue, a coveted artist's pigment, comes from lapis lazuli and is often treated in various ways, but its identification in paintings is not well understood.
- Researchers used X-ray spectroscopy to analyze how heating lapis lazuli before extracting lazurite affects the sulfur compounds in the pigment.
- The study found that heat treatment increases specific sulfur signals correlated with a stronger blue color in lazurite, helping to identify historical paint samples created from these treated materials.
Self-assembled monolayers (SAMs) of carboxylated alkanethiolates (-S(CH(2))(n-1)CO(2)(-)) on flat gold electrode surfaces are used to tether small (ca. 2 nm d.) iridium(IV) oxide nanoparticles (Ir(IV)O(X) NPs) to the electrode.
View Article and Find Full Text PDFTailored ad-hoc methods must be developed for successful identification of minute amounts of natural dyes on works of art using Surface-Enhanced Raman Spectroscopy (SERS). This article details two of these successful approaches using silver film over nanosphere (AgFON) substrates and silica gel coupled with citrate-reduced Ag colloids. The latter substrate functions as the test system for the coupling of thin-layer chromatography and SERS (TLC-SERS), which has been used in the current research to separate and characterize a mixture of several artists' dyes.
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